Napier

Napier lies between the Pacific coast and the low hills of Taradale and Poraiti. Mostly residential, the city has a light industrial centre plus a busy shipping port.

Air quality in Napier city is monitored at Marewa Park. The continuous monitoring sites in Hawke’s Bay measure surrounding (ambient) PM10 levels rather than focus on a particular single source. Therefore the Marewa Park reflects typical residential areas, has average traffic levels and is not dominated by any particular industrial source, whereas the Awatoto site reflects a coastal area dominated by industrial activity.

HBRC analyses air quality trends for days when poor air quality is expected – we call these ‘characteristic’ days. These days are when the daily average temperate is below 11 deg C and the mean wind speed is less than 5km/h. These sites are part of HBRC’s state of the environment (SOE) monitoring network. Through winter HBRC reports publicly on compliance with the NES for air quality so that the public are aware of air quality. The results are also reported in the annual SOE report. Mobile and short-term monitoring is also done periodically.

Town Summary

Air quality in this town

The main source of air pollution is from home heating wood burners. PM10 typically builds up over 24 hrs on cold still nights after a southerly air stream has moved through the region.

Population

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Number of households

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This information is collated from 2013 Census information. The census is the official count of how many people and dwellings there are in New Zealand.
Census information is collated every five years.

Sources of air pollution

In this town, where do emissions come from?

The split between home heating, industrial, outdoor burning and traffic sources

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Sources of PM10 emissions

Source

Annual percentage

Winter day percentage

Home heating

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Industrial

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Outdoor burning

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Traffic

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Relative breakdown

Annual

Winter day

The table shows the proportions of the main sources of PM10 in this town from home heating, industrial activities, outdoor burning and traffic. (Indoor sources and natural sources of air pollutants are not included in this breakdown).

These values come from 2013 data sourced from MfE’s data service. Consistent methodology was used to calculate these estimates of PM10 emissions, which allows comparison between towns throughout New Zealand. Some regional council published emissions information might differ if they were prepared in a different year or used another method. Contact your regional council for more information about PM10 and other emissions.

Seasonal variation

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Concentration (µg/m3)

Wind speed (km/h)

Air temperature (℃)

What is this graph showing me?

The graph shows the monthly average PM10 concentration at one representative site in this town for the year selected.
In many towns in New Zealand, PM10 peaks in the winter when air temperatures and wind speeds are lowest as more people
heat their homes during colder weather, and still conditions mean that there is no wind to disperse the air pollutants.

Sites 1

Monitored sites in Napier

Monitored sites in this town can be categorised according to location:

Residential: Air monitoring site is in a suburban area with a relatively high population density, but not close to a busy road or industry.

Traffic: Air monitoring site is very close to a busy road or intersection.

Industry: Air monitoring site is close to industry, including heavy commercial and processing factories.

Coastal: Air monitoring site is close to the coast where there are high levels of sea salt in the air.

NES: A site monitored for compliance with the National Environmental Standards for Air Quality (NES-AQ).